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mirror of https://github.com/minio/minio.git synced 2025-01-17 17:53:15 -05:00
Harshavardhana 52221db7ef
fix: for unexpected errors in reading versioning config panic ()
We need to make sure if we cannot read bucket metadata
for some reason, and bucket metadata is not missing and
returning corrupted information we should panic such
handlers to disallow I/O to protect the overall state
on the system.

In-case of such corruption we have a mechanism now
to force recreate the metadata on the bucket, using
`x-minio-force-create` header with `PUT /bucket` API
call.

Additionally fix the versioning config updated state
to be set properly for the site replication healing
to trigger correctly.
2022-05-31 02:57:57 -07:00

168 lines
4.6 KiB
Go

// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package versioning
import (
"encoding/xml"
"io"
"strings"
"github.com/minio/pkg/wildcard"
)
// State - enabled/disabled/suspended states
// for multifactor and status of versioning.
type State string
// Various supported states
const (
Enabled State = "Enabled"
// Disabled State = "Disabled" only used by MFA Delete not supported yet.
Suspended State = "Suspended"
)
var (
errExcludedPrefixNotSupported = Errorf("excluded prefixes extension supported only when versioning is enabled")
errTooManyExcludedPrefixes = Errorf("too many excluded prefixes")
)
// ExcludedPrefix - holds individual prefixes excluded from being versioned.
type ExcludedPrefix struct {
Prefix string
}
// Versioning - Configuration for bucket versioning.
type Versioning struct {
XMLNS string `xml:"xmlns,attr,omitempty"`
XMLName xml.Name `xml:"VersioningConfiguration"`
// MFADelete State `xml:"MFADelete,omitempty"` // not supported yet.
Status State `xml:"Status,omitempty"`
// MinIO extension - allows selective, prefix-level versioning exclusion.
// Requires versioning to be enabled
ExcludedPrefixes []ExcludedPrefix `xml:",omitempty"`
ExcludeFolders bool `xml:",omitempty"`
}
// Validate - validates the versioning configuration
func (v Versioning) Validate() error {
// Not supported yet
// switch v.MFADelete {
// case Enabled, Disabled:
// default:
// return Errorf("unsupported MFADelete state %s", v.MFADelete)
// }
switch v.Status {
case Enabled:
const maxExcludedPrefixes = 10
if len(v.ExcludedPrefixes) > maxExcludedPrefixes {
return errTooManyExcludedPrefixes
}
case Suspended:
if len(v.ExcludedPrefixes) > 0 {
return errExcludedPrefixNotSupported
}
default:
return Errorf("unsupported Versioning status %s", v.Status)
}
return nil
}
// Enabled - returns true if versioning is enabled
func (v Versioning) Enabled() bool {
return v.Status == Enabled
}
// Versioned returns if 'prefix' has versioning enabled or suspended.
func (v Versioning) Versioned(prefix string) bool {
return v.PrefixEnabled(prefix) || v.PrefixSuspended(prefix)
}
// PrefixEnabled - returns true if versioning is enabled at the bucket and given
// prefix, false otherwise.
func (v Versioning) PrefixEnabled(prefix string) bool {
if v.Status != Enabled {
return false
}
if prefix == "" {
return true
}
if v.ExcludeFolders && strings.HasSuffix(prefix, "/") {
return false
}
for _, sprefix := range v.ExcludedPrefixes {
// Note: all excluded prefix patterns end with `/` (See Validate)
sprefix.Prefix += "*"
if matched := wildcard.MatchSimple(sprefix.Prefix, prefix); matched {
return false
}
}
return true
}
// Suspended - returns true if versioning is suspended
func (v Versioning) Suspended() bool {
return v.Status == Suspended
}
// PrefixSuspended - returns true if versioning is suspended at the bucket level
// or suspended on the given prefix.
func (v Versioning) PrefixSuspended(prefix string) bool {
if v.Status == Suspended {
return true
}
if v.Status == Enabled {
if prefix == "" {
return false
}
if v.ExcludeFolders && strings.HasSuffix(prefix, "/") {
return true
}
for _, sprefix := range v.ExcludedPrefixes {
// Note: all excluded prefix patterns end with `/` (See Validate)
sprefix.Prefix += "*"
if matched := wildcard.MatchSimple(sprefix.Prefix, prefix); matched {
return true
}
}
}
return false
}
// PrefixesExcluded returns true if v contains one or more excluded object
// prefixes or if ExcludeFolders is true.
func (v Versioning) PrefixesExcluded() bool {
return len(v.ExcludedPrefixes) > 0 || v.ExcludeFolders
}
// ParseConfig - parses data in given reader to VersioningConfiguration.
func ParseConfig(reader io.Reader) (*Versioning, error) {
var v Versioning
if err := xml.NewDecoder(reader).Decode(&v); err != nil {
return nil, err
}
if err := v.Validate(); err != nil {
return nil, err
}
return &v, nil
}